$OpenBSD: patch-configure_ac,v 1.1 2017/04/28 21:01:17 ajacoutot Exp $

No librt on OpenBSD.

--- configure.ac.orig	Fri Apr 28 20:55:39 2017
+++ configure.ac	Fri Apr 28 20:56:19 2017
@@ -109,6 +109,9 @@ case "${host_os}" in
     powerpc-*-darwin*)
         OPENCL_LIBS=""
         ;;
+    *openbsd*)
+        AM_CONDITIONAL([ADD_RT], false)
+        ;;
     *)
         # default
         AM_CONDITIONAL([ADD_RT], true)
